ex 
The ligula consists of two elongate slender processes, covered 
with hair, converging behind so asto form a Y ; they are similar 
to what exists in the genus Dorysthenes, but more elongate. 
The prothoracic stigmata are transverse, and of rather large 
size, similar in position and in most respects to those of Dory- 
slhenes. 
The elytra are completely soldered together, and are so exactly 
adapted to the base of the mesonotum and to the scutellum that 
it is difficult to detach them. There is no trace of wings. 
The inetanotum is reduced to a very délicate homogeneous mem- 
brane, without structure or divisions, and similar in size and 
other respects to the dorsal abdominal segments. These latter are 
seven in number, and are merely délicate membranes, except the 
last one, which is between corneous and membranous in consis- 
tence. 
The stigmata are small and are placed at the outermargin of 
the dorsal plates, the metaihoracic stigma is scarcely largerthan 
the others. 
The ventral plates are very hard, but they are capable of much 
motion, and there is a membrane of considérable size attached to 
each, so as to allow the hind-body to be considerably elongated. 
The ventral plates are five in number. There is a small supplemen- 
tary internai, apical segment, which can be extruded. The œdea- 
gus is elongate and simple, of the ordinary tubular character 
found in the Drionidœ. 
It is also worth noting, that the individual dissected had when 
sent some but a single antenna, which moreover become detached 
during the journey from Brazil to Scotland, but which I found in 
the box of transmission ; it is very remarkable in as much as from 
the third joint there lias preceeded a supplementary antenna; this 
curious anomaly is articulated to the third joint — which is consi- 
derably enlarged — by a true pocket joint, and although there now 
exists only a single joint of the unnatural organ there liave evi- 
dently been others présent in addition. 
In comparing the organisation of H ypocephalus with a Longicorn 
such as Dorysthenes rostratus, or D. montanus, one cannot but 
be impressed with the general similarity of their organisation. A 
similarit.y which is in point of fact so great, that it is certain that 
H ypocephalus must be placed near to Dorysthenes, and the only 
question that can exist is whether it is sufficiently different to be 
treated as a distinct family allied to the Longicorns by means of 
Dorysthenes , or merely as an abnormal member of the family 
Cerambycidœ. The latter course appears to me certainly the 
correct one. 
